A picture shows the building housing the Ecuadorian embassy in central London on June 19, 2016, where WikiLeaks founder Julian Assange has hold up for four years. Assange started his fifth year camped out in the Ecuadoran embassy in London on June 19, an occasion his supporters were to mark with events celebrating whistleblowers. The 44-year-old is wanted for questioning over a 2010 rape allegation in Sweden but has been inside Ecuador's UK mission for four full years in a bid to avoid extradition. The Australian former computer hacker fears that from Sweden he could be extradited to the United States over WikiLeaks' release of 500,000 secret military files, and could face a long prison sentence there. / AFP PHOTO / Daniel Leal-OlivasDANIEL LEAL-OLIVAS/AFP/Getty Images

A picture shows the coat of arms on the balcony at the front of the Ecuadorian embassy in central London on June 19, 2016, where WikiLeaks founder Julian Assange has hold up for four years. Assange started his fifth year camped out in the Ecuadoran embassy in London on June 19, an occasion his supporters were to mark with events celebrating whistleblowers. The 44-year-old is wanted for questioning over a 2010 rape allegation in Sweden but has been inside Ecuador's UK mission for four full years in a bid to avoid extradition. The Australian former computer hacker fears that from Sweden he could be extradited to the United States over WikiLeaks' release of 500,000 secret military files, and could face a long prison sentence there. / AFP PHOTO / Daniel Leal-OlivasDANIEL LEAL-OLIVAS/AFP/Getty Images

A picture shows the building housing the Ecuadorian embassy in central London on June 19, 2016, where WikiLeaks founder Julian Assange has hold up for four years. Assange started his fifth year camped out in the Ecuadoran embassy in London on June 19, an occasion his supporters were to mark with events celebrating whistleblowers. The 44-year-old is wanted for questioning over a 2010 rape allegation in Sweden but has been inside Ecuador's UK mission for four full years in a bid to avoid extradition. The Australian former computer hacker fears that from Sweden he could be extradited to the United States over WikiLeaks' release of 500,000 secret military files, and could face a long prison sentence there. / AFP PHOTO / Daniel Leal-OlivasDANIEL LEAL-OLIVAS/AFP/Getty Images

NEW YORK, NY - JUNE 17: (L-R) Chief Technology Officer at Estee Lauder Rhonsa Vetere, and models Brenda Schad and Roshumba Williams attend Rhonda Vetere's Beauty and Crowns Event at The Skylark on June 17, 2016 in New York City. (Photo by Slaven Vlasic/Getty Images for Rhonda Vetere)

NEW YORK, NY - JUNE 17: (L-R) News anchor Cheryl Casone, Chief Technology Officer at Estee Lauder Rhonda Vetere, and model Roshumba Williams attend Rhonda Vetere's Beauty and Crowns Event at The Skylark on June 17, 2016 in New York City. (Photo by Slaven Vlasic/Getty Images for Rhonda Vetere)

NEW YORK, NY - JUNE 17: Chief Technology Officer at Estee Lauder Rhonda Vetere (L) and news anchor Cheryl Casone attend Rhonda Vetere's Beauty and Crowns Event at The Skylark on June 17, 2016 in New York City. (Photo by Slaven Vlasic/Getty Images for Rhonda Vetere)

This artist's concept image released by NASA on June 17, 2016 shows NASA's X-57 Hybrid Electric Research Plane. With 14 electric motors turning propellers and all of them integrated into a uniquely-designed wing, NASA will test new propulsion technology using an experimental airplane now designated the X-57 and nicknamed Maxwell. This artist's concept of the X-57 shows the plane's specially designed wing and 14 electric motors. NASA Aeronautics researchers will use the Maxwell to demonstrate that electric propulsion can make planes quieter, more efficient and more environmentally friendly. / AFP PHOTO / NASA Langley/Advanced Concepts Lab, AMA, Inc. / Handout / RESTRICTED TO EDITORIAL USE - MANDATORY CREDIT "AFP PHOTO / NASA Langley/Advanced Concepts Lab, AMA, Inc." - NO MARKETING NO ADVERTISING CAMPAIGNS - DISTRIBUTED AS A SERVICE TO CLIENTS HANDOUT/AFP/Getty Images

Argentinian industrial engeneering student of the National University of Cuyo (UNCUYO), Marcos Bruno (L), and his collaborator, Argentinian engeneering student of the National Technological University (UTN) Gabriel Caballero, work on a robot made by them, in Mendoza, Argentina on June 17, 2016. Twenty-year-old Bruno's project -a robot which can install instruments and transport light weighs in Mars- was selected by The Mars Society, a US scientific organization which collaborates with the NASA, among thousands. / AFP PHOTO / Andres Larrovere / TO GO WITH AFP STORY BY SONIA AVALOSANDRES LARROVERE/AFP/Getty Images